diff --git a/web/cashtab/src/components/Send/Send.js b/web/cashtab/src/components/Send/Send.js
--- a/web/cashtab/src/components/Send/Send.js
+++ b/web/cashtab/src/components/Send/Send.js
@@ -22,6 +22,8 @@
     toLegacy,
 } from '@components/Common/Ticker.js';
 import { Event } from '@utils/GoogleAnalytics';
+import BigNumber from 'bignumber.js';
+
 export const BalanceHeader = styled.div`
     p {
         color: #777;
@@ -208,7 +210,7 @@
         let bchValue = value;
 
         if (selectedCurrency === 'USD') {
-            bchValue = (value / fiatPrice).toFixed(8);
+            bchValue = new BigNumber((value / fiatPrice).toFixed(8)).toString();
         }
 
         try {
@@ -333,23 +335,27 @@
     const handleBchAmountChange = e => {
         const { value, name } = e.target;
         let error = false;
-        let bchValue = value;
+
+        let BigNumCashAmount = new BigNumber(value);
 
         if (selectedCurrency === 'USD') {
-            bchValue = (value / fiatPrice).toFixed(8);
+            BigNumCashAmount = new BigNumber((value / fiatPrice).toFixed(8));
         }
 
         // Validate value for > 0
-        if (isNaN(bchValue)) {
+        if (isNaN(BigNumCashAmount)) {
             error = 'Amount must be a number';
-        } else if (bchValue <= 0) {
+        } else if (BigNumCashAmount.lte(0)) {
             error = 'Amount must be greater than 0';
-        } else if (bchValue < currency.dust) {
+        } else if (BigNumCashAmount.lt(currency.dust)) {
             error = `Send amount must be at least ${currency.dust} ${currency.ticker}`;
-        } else if (bchValue > balances.totalBalance) {
+        } else if (BigNumCashAmount.gt(new BigNumber(balances.totalBalance))) {
             error = `Amount cannot exceed your ${currency.ticker} balance`;
-        } else if (!isNaN(bchValue) && bchValue.toString().includes('.')) {
-            if (bchValue.toString().split('.')[1].length > 8) {
+        } else if (
+            !isNaN(BigNumCashAmount) &&
+            BigNumCashAmount.toString().includes('.')
+        ) {
+            if (BigNumCashAmount.toString().split('.')[1].length > 8) {
                 error = `${currency.ticker} transactions do not support more than 8 decimal places`;
             }
         }
diff --git a/web/cashtab/src/hooks/__tests__/useBCH.test.js b/web/cashtab/src/hooks/__tests__/useBCH.test.js
--- a/web/cashtab/src/hooks/__tests__/useBCH.test.js
+++ b/web/cashtab/src/hooks/__tests__/useBCH.test.js
@@ -7,6 +7,7 @@
 import BCHJS from '@psf/bch-js'; // TODO: should be removed when external lib not needed anymore
 import { currency } from '../../components/Common/Ticker';
 import sendBCH from '../__mocks__/sendBCH';
+import BigNumber from 'bignumber.js';
 
 describe('useBCH hook', () => {
     it('gets Rest Api Url on testnet', () => {
@@ -159,7 +160,11 @@
             .mockResolvedValue(expectedTxId);
         const failedSendBch = sendBch(BCH, wallet, utxos, {
             addresses,
-            values: [0.00000546 - 0.00000001],
+            values: [
+                new BigNumber('0.00000546')
+                    .minus(new BigNumber('0.00000001'))
+                    .toString(),
+            ],
         });
         expect(failedSendBch).rejects.toThrow(new Error('dust'));
         const nullValuesSendBch = await sendBch(BCH, wallet, utxos, {